Flexural performance of reinforced concrete beams made by innovative post-filling coarse aggregate process

Abstract

Concrete made by post-filling coarse aggregate process could reduce the cement content greatly compared with traditional concrete placement method. Thus, it not only lowers the production cost of concrete through lower usage of cement but also reduces the CO2 emissions to the environment. In this paper, the compressive and tensile strength of post-filling coarse aggregate concrete with different post-filling ratios (PFRs) (0%, 10%, 15%, 20%, 25%, 30%) and concrete strength grades (C30, C40, C50) were first studied. Then the flexural performance of nineteen concrete beams with different concrete strength, post-filling ratios, reinforcement ratios was investigated. The experimental results showed that the compressive strength and elastic modulus of the post-filling coarse aggregate concrete increased with the increase of the post-filling ratio of coarse aggregate, reaching the peak value at the filling ratio of 20%. It indicated that there was no obvious difference in the failure mode as well as middle-span deflections between post-filling coarse aggregate concrete (PFCC) beams and ordinary concrete (OC) beams. Ductile failure was observed for all nineteen specimens. Results demonstrated that the cracking load, yield load, and ultimate load of the post-filling coarse aggregate concrete beams all reached the peak value at the post-filling ratio of 20%. In addition, the theoretical predictions of cracking loads and ultimate load carrying capacities matched the experimental results in satisfactory agreement.

Seismic performance of reinforced concrete beam‐column joint made of post‐filling coarse aggregate concrete

“…It was suggested that the post-filling ratio of coarse aggregate for C30 concrete is 20%. Jia et al 23 studied the flexural performance of the post-filling aggregate concrete research and results shows that the average strain of the normal section of the postfilling aggregate concrete beam conforms to the plane section assumption. The flexural failure phenomenon of post-filling aggregate concrete beam is similar to that of reference concrete.…”

“…Although the basic properties, flexural and shear properties of beams as well as axial compression and eccentric compression of columns specimens have been investigated, 1,[22][23][24][25][26] the seismic behavior of beam-column joint made of post-filling coarse aggregate concrete has not been reported. It is crucial to study and understand the seismic behavior of post filling coarse aggregate to facilitate its application in engineering.…”

Theoretical analysis of the moment–curvature relationship of coal gangue concrete beams

“…For the theoretical calculation of the flexural performance of concrete beams in this aspect of research, Du et al (Du et al 2021) carried out a theoretical analysis of the flexural performance of alkali-activated concrete beams. And Jia et al (Jia et al 2021) carried out a theoretical analysis of the flexural performance of concrete beams with the coarse aggregate post-filling process. But at present, there is no relevant theoretical analysis of the flexural performance of steel fiber reinforced gangue concrete beam, which has brought inconvenience to the application of engineering structural designers.…”